<?php

/**
 * @file
 * Contains the basic 'node' field handler.
 */

/**
 * Field handler to provide simple renderer that allows linking to a node.
 * Definition terms:
 * - link_to_node default: Should this field have the checkbox "link to node" enabled by default.
 */
class views_handler_field_node extends views_handler_field {

    /**
     * Constructor to provide additional field to add.
     */
    function construct() {
        parent::construct();
        $this->additional_fields['nid'] = array('table' => 'node', 'field' => 'nid');
        if (module_exists('translation')) {
            $this->additional_fields['language'] = array('table' => 'node', 'field' => 'language');
        }
    }

    function option_definition() {
        $options = parent::option_definition();
        $options['link_to_node'] = array('default' => isset($this->definition['link_to_node default']) ? $this->definition['link_to_node default'] : FALSE);
        return $options;
    }

    /**
     * Provide link to node option
     */
    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $form['link_to_node'] = array(
            '#title' => t('Link this field to its node'),
            '#description' => t('This will override any other link you have set.'),
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['link_to_node']),
        );
    }

    /**
     * Render whatever the data is as a link to the node.
     *
     * Data should be made XSS safe prior to calling this function.
     */
    function render_link($data, $values) {
        if (!empty($this->options['link_to_node'])) {
            if ($data !== NULL && $data !== '') {
                $this->options['alter']['make_link'] = TRUE;
                $this->options['alter']['path'] = "node/" . $values->{$this->aliases['nid']};
                if (isset($this->aliases['language'])) {
                    $languages = language_list();
                    if (isset($languages[$values->{$this->aliases['language']}])) {
                        $this->options['alter']['language'] = $languages[$values->{$this->aliases['language']}];
                    } else {
                        unset($this->options['alter']['language']);
                    }
                }
            } else {
                $this->options['alter']['make_link'] = FALSE;
            }
        }
        return $data;
    }

    function render($values) {
        return $this->render_link(check_plain($values->{$this->field_alias}), $values);
    }

}
